CODEWITHSUNDEEP
javascriptplugins
Ky -
Ky -

Reputation: 32143

How can I attach a window resize event listener in JavaScript?

I'm making a JS/PHP plugin for distribution. I want it to be as easy to install as this:

<HTML>
<HEAD>
<TITLE>Testing my Plugin</TITLE>
<?php
  include 'path/to/myPlugin.php';
  echo getMyPluginHeadContent();
?>
</HEAD>
<BODY>
<?php
  echo getMyPluginContent("Arguments will go here");
?>
</BODY>
</HTML>

However, I want this plugin to attach a window resize listener without overriding window.onresize, in case there are any other scripts that also require the use of that method. Is there any javascript command like document.addEventListener("resize", myResizeMethod, true);? I know that's not it, because that's not working, and the MDN and W3C are very vague about what arguments addEventListener takes.

I do not want an answer telling me to use window.onresize = myResizeMethod or <BODY ONRESIZE="myResizeMethod">, as these are not as plugin-friendly.

Upvotes: 41

Views: 104160

Answers (3)

asciidude
asciidude

Reputation: 282

I highly recommend ResizeObserver

https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver

Example of use:

const resizeObserver = new ResizeObserver(e => {
    console.log(e);
});

resizeObserver.observe(document.body);

Upvotes: 3

Kyle
Kyle

Reputation: 4449

Since you are trying to call this function on the resize of the window, you will want to bind the function to the window and not to the document. To support versions of IE that are less than 9, you will want to use attachEvent. Please note that attachEvent requires you to specify the on keyword. Here is an example:

if(window.attachEvent) {
    window.attachEvent('onresize', function() {
        alert('attachEvent - resize');
    });
}
else if(window.addEventListener) {
    window.addEventListener('resize', function() {
        console.log('addEventListener - resize');
    }, true);
}
else {
    //The browser does not support Javascript event binding
}

Similarly, you can remove events in the same way. When using removeEventListener, make sure that you pass the same value of useCapture as you did when calling addEventListener. This is the third parameter which is the true/false value.

if(window.detachEvent) {
    window.detachEvent('onresize', theFunction);
}
else if(window.removeEventListener) {
    window.removeEventListener('resize', theFunction, true);
}
else {
    //The browser does not support Javascript event binding
}

Upvotes: 83

Denys S&#233;guret
Denys S&#233;guret

Reputation: 382404

You don't resize the document but the window. This works :

window.addEventListener("resize", function(){console.log('resize!')}, true);

Upvotes: 33

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